Bit holder equipped with a spraying device
US4542942A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1983 |
| Grant date | Sep 24, 1985 |
| Priority date | — |
| Expiry date | Jun 14, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C35/187
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A bit holder equipped with a spraying device, comprising a receiving bore (2) in which the bit shaft (3) is supported, for limited axial shifting movement and optionally for being rotated, shifting movement of the bit shaft (3) in direction of the cutting pressure being limited by abutment (5) and the bit shaft being loaded by a return force in opposite direction to the cutting pressure and a valve (10, 11) for the supply of water to the bit or to the working or drift face during cutting operation being arranged within the bit holder (1) and being opened under the action of the cutting pressure by the axial shifting movement of the bit shaft (3). The valve housing (9) is inserted into the receiving bore (2). The rear end of the bit shaft (3) acts directly on the shaft (12) of the valve cone (10). Within the mantle of the receiving bore (2) and in front of the valve housing (9) there are provided passages (16) through which contaminations entering into the receiving bore (2) along the bit shaft (3) can be discharged in outward direction before they can arrive at the valve seat (11). The shaft (12) of the valve cone (10) is preferably guided within the valve housing (9), so that cont…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.